#root::data::List
IterRef root/data/List.vi:430
struct IterRef[T](...);
iterator root/data/List.vi:433
impl iterator[T]: Iterator[IterRef[T], &T];
fork root/data/List.vi:444
impl fork[T]: Fork[IterRef[T]];
drop root/data/List.vi:445
impl drop[T]: Drop[IterRef[T]];
tail root/data/List.vi:449
fn tail[T](...: &IterRef[T]) -> &List[T];
Convert this iterator into a reference to the remaining tail of the list. O(1)